<form action="/myForm/" method="post">
    {% csrf_token %}
    {% for round in r_count %}
        <select name="rates_{{forloop.counter}}">
          <option value="volvo">Volvo</option>
          <option value="saab">Saab</option>
          <option value="fiat">Fiat</option>
          <option value="audi">Audi</option>
        </select>
    <hr>
    {% endfor %}
    <input type="submit" value="OK">
</form>
